汽车的方向盘及其附近的组合开关形成典型的复合操作器。
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What is random coil?Why polymers always showrandom coil in solution or melt states? (用中文回答)
List the main differences in molar mass between polymers and other chemical compounds. ( answer in English)
Explain the terms of "mono-disperse" and "polydispersity index".( answer in English)